MP3 player with line-out?
 

I recently added the BMW auxiliary audio kit to my Z4, so now I can listen to any external device with the stereo system. I'd like to use an MP3 player based on a USB flash drive, but I want one with line-out rather than using the headphone jack. Has anyone heard of a flash-based player that has a line-out jack?

I have used the headphone jack of my Sandisk m260 as an input to an amplifier. It's a little on the low side, but works. I love the solid state design. There is no hard drive to mess up. It's easy to use with windows. I just drag and drop my mp3 files onto the device in Windows Explorer. When you plug it into the USB port it shows up as another hard drive.
http://www.sandisk.com/Products/Item(1940)-SDMX4-4096-Sansa_e260_MP3_Player_4GB.aspx
It is a little cheaper than the ipod version. I bought mine at a Best Buy sale when Office Max had them on sale as well. It ended up being $149 with an additional $30 rebate for an after rebate price of $$130 or so after taxes.